Air distribution unit



FIG. 1 is a top perspective view of the air distribution unit showing our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an end elevation view thereof;

FIG. 6 is an opposite end elevation view thereof;

FIG. 7 is a side elevation view thereof; and,

FIG. 8 is an opposite side elevation view thereof.

The broken line showing of environmental structure in FIGS. 1-8 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an air distribution unit, as shown and described. 